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what do you not understand exactly ?

Everything!

Do you know how reward system work on hive ?

Yes, I do

Ok, By the way, thanks to this manipulation, you'll be able to vote on #inleo at 100% of your leopower while saving your hivepower, for example, to curate other long-form posts.

I understand all that part. What I need help to understand is how to set it on the ex

Go to https://leodex.io/rewards
click on the lightning button and ajust the multiplier.
With a 20 multiplier if you vote at 5% of your hive power in #inleo , the vote will have a 5 X 20 -> 100% LeoPower vote.